glibc2/libc6 infortmation

hy.
is there a small documentation on glibc2/libc6 ?
- which packages are needed to compile programs based on libc6
- which packages are needed then to compile programs with old libc5
- flags etc. nedded to force gcc to compile with libc5
i tried recent gcc, libc6, libc5, altlibc5, ld.so (most from
experminental), but i could not compile everything :
i compiled a program with -b i486-linuxlibc1, and everything worked,
till gcc tried to link it :
undefined reference _IO_putc
glibc2 has a _IO_putc, but libc5 has a #define makro, so the compile
shouldn't ask for _IO_putc ...
(i tried using -I/usr/i486-linuxlibc1/include but it didn't help)
regards, andreas
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